No, Michael, you've missed the point.

There is nothing wrong with transporting a DSL circuit over quad wire. We make the argument that since a DSL circuit travels miles over outside plant subscriber cable, which has fewer twists than Cat 3, then it stands to reason that the final few feet do not require anything with more twists, like Cat 3 through 6.

In fact, DSL will work over a half-pair.

Arthur P. Bloom
"30 years of faithful service...15 years on hold"